package test;

import java.net.InetSocketAddress;
import java.nio.ByteBuffer;
import java.nio.channels.SelectionKey;
import java.nio.channels.Selector;
import java.nio.channels.ServerSocketChannel;
import java.nio.channels.SocketChannel;
import java.time.LocalDate;
import java.util.Iterator;
import java.util.Scanner;

import org.junit.Test;

public class NoBlock {
	@Test
	public void client() throws Exception{
		//1. 获取通道
		SocketChannel clientSoc=SocketChannel.open(new InetSocketAddress("127.0.0.1", 9988));
		//2. 切换非阻塞模式
		clientSoc.configureBlocking(false);
		//3. 分配指定大小的缓冲区
		ByteBuffer allocate = ByteBuffer.allocate(1024);
		//4. 发送数据给服务端
		Scanner sc=new Scanner(System.in);
		while(sc.hasNext()){
			String next = sc.next();
			allocate.put((LocalDate.now()+"--客户端说"+"\n"+next).getBytes());
			allocate.flip();
			clientSoc.write(allocate);
			allocate.clear();
		}
		sc.close();
		//5. 关闭通道
		clientSoc.close();
	}
	
	
	@Test
	public void Server() throws Exception{
		//1. 获取通道
		ServerSocketChannel serSoc=ServerSocketChannel.open();
		//2. 切换非阻塞模式
		serSoc.configureBlocking(false);
		//3. 绑定连接
		serSoc.bind(new InetSocketAddress(9988));
		//4. 获取选择器
		Selector selector = Selector.open();
		//5. 将通道注册到选择器上, 并且指定“监听接收事件”
		serSoc.register(selector,  SelectionKey.OP_ACCEPT);
		//6. 轮询式的获取选择器上已经“准备就绪”的事件
		while(selector.select()>0){
			//7. 获取当前选择器中所有注册的“选择键(已就绪的监听事件)”
			Iterator<SelectionKey> iterator = selector.selectedKeys().iterator();
			while(iterator.hasNext()){
				//8. 获取准备“就绪”的是事件
				SelectionKey sk = iterator.next();
				//9. 判断具体是什么事件准备就绪
				if(sk.isAcceptable()){
					//10. 若“接收就绪”，获取客户端连接
					SocketChannel sChannel = serSoc.accept();
					//11. 切换非阻塞模式
					sChannel.configureBlocking(false);
					//12. 将该通道注册到选择器上
					sChannel.register(selector, SelectionKey.OP_READ);
				}else if(sk.isReadable()){
					//13. 获取当前选择器上“读就绪”状态的通道
					SocketChannel sChannel = (SocketChannel) sk.channel();
					//14. 读取数据
					ByteBuffer buf = ByteBuffer.allocate(1024);
					int len = 0;
					while((len = sChannel.read(buf)) > 0 ){
						buf.flip();
						System.out.println(new String(buf.array(), 0, len));
						buf.clear();
					}
				}
			}
			//15. 取消选择键 SelectionKey
			iterator.remove();
		}
		System.out.println("1111111111");
	}
}
